The correct stability order of the following | vedclass

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(C) The stability of carbocations is determined by the electron-donating or electron-withdrawing nature of the substituents attached to the conjugated

Vedclass · Accepted Answer

$III > IV > I > II$

Vedclass · Answer

(C) The stability of carbocations is determined by the electron-donating or electron-withdrawing nature of the substituents attached to the conjugated system.$1$. In $III$ and $IV$,the groups $-NMe_2$ and $-OMe$ show a strong $+R$ (resonance) effect,which stabilizes the carbocation significantly.$2$. Since nitrogen is less electronegative than oxygen,the lone pair on $N$ is more easily donated,making $-NMe_2$ a stronger $+R$ group than $-OMe$. Thus,$III > IV$.$3$. In $I$,the $-CH_3$ group shows a weak $+I$ (inductive) effect and hyperconjugation,providing moderate stability.$4$. In $II$,the $-BMe_2$ group has an empty $p$-orbital and shows a $-R$ effect,which destabilizes the carbocation.$5$. Therefore,the correct stability order is $III > IV > I > II$.

The correct stability order of the following carbocations is:
$I$. $H_2C^+-CH=CH-CH_3$
$II$. $H_2C^+-CH=CH-BMe_2$
$III$. $H_2C^+-CH=CH-NMe_2$
$IV$. $H_2C^+-CH=CH-OMe$

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The correct stability order of the following carbocations is:$I$. $H_2C^+-CH=CH-CH_3$$II$. $H_2C^+-CH=CH-BMe_2$$III$. $H_2C^+-CH=CH-NMe_2$$IV$. $H_2C^+-CH=CH-OMe$